$178 Find Cheap Flights from Ontario to Seattle - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Seattle departing on 8/27. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

Save 20% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Flight Deals
Useful Info
Flight Deals

Cheap Flights from Ontario to Seattle

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Seattle

Mon, Sep 14 - Mon, Sep 21
WestJet Logo
12:25 pm - 6:45 pm
YOW
-
SEA
9h 20m
2 stops
WestJet Logo
7:35 pm - 5:35 am
SEA
-
YOW
7h 00m
1 stop
$319WestJet
Sat, Sep 26 - Sat, Oct 3
WestJet Logo
6:45 am - 6:45 pm
YUL
-
SEA
15h 00m
2 stops
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
$320WestJet
Tue, Sep 15 - Tue, Sep 22
Air Canada Logo
7:20 pm - 9:39 pm
YYZ
-
SEA
5h 19mnonstop
Air Canada Logo
8:00 am - 3:41 pm
SEA
-
YYZ
4h 41mnonstop
$357Air Canada
Thu, Sep 24 - Wed, Sep 30
Air Canada Logo
6:45 pm - 9:04 pm
YYZ
-
SEA
5h 19mnonstop
Air Canada Logo
8:00 am - 3:41 pm
SEA
-
YYZ
4h 41mnonstop
$358Air Canada
Fri, Sep 25 - Mon, Sep 28
Multiple Airlines Logo
8:35 pm - 9:42 am
YYZ
-
SEA
16h 07m
1 stop
Multiple Airlines Logo
7:35 pm - 5:45 am
SEA
-
YYZ
7h 10m
1 stop
$376Multiple Airlines
Tue, Aug 25 - Sun, Aug 30
Delta Logo
12:47 pm - 10:05 pm
YUL
-
SEA
12h 18m
1 stop
Delta Logo
11:56 am - 11:52 pm
SEA
-
YUL
8h 56m
1 stop
$377Delta
Wed, Sep 30 - Wed, Oct 14
Multiple Airlines Logo
1:30 pm - 6:45 pm
YYZ
-
SEA
8h 15m
1 stop
Multiple Airlines Logo
9:16 pm - 6:39 am
SEA
-
YYZ
30h 23m
1 stop
$379Multiple Airlines
Sat, Oct 17 - Wed, Oct 21
Delta Logo
9:40 am - 6:35 pm
YYZ
-
SEA
11h 55m
1 stop
Delta Logo
11:10 pm - 1:36 pm
SEA
-
YYZ
11h 26m
1 stop
$380Delta
Wed, Oct 21 - Wed, Oct 28
Alaska Airlines Logo
4:55 pm - 7:26 pm
YYZ
-
SEA
5h 31mnonstop
Alaska Airlines Logo
8:20 am - 4:05 pm
SEA
-
YYZ
4h 45mnonstop
$384Alaska Airlines
Tue, Sep 29 - Wed, Nov 25
Alaska Airlines Logo
4:55 pm - 7:13 pm
YYZ
-
SEA
5h 18mnonstop
Alaska Airlines Logo
8:31 am - 4:05 pm
SEA
-
YYZ
4h 34mnonstop
$385Alaska Airlines
Useful Info

Good to know

Low season

January

Cheapest flight

$178
Best time to beat the crowds with an average 16% drop in price.
Flight from Ottawa to Seattle

FAQs for booking flights from Ontario to Seattle

  • How does KAYAK find such low prices on flights from Ontario to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Centralia
Fife
Lakewood
Mukilteo
Westport
Lacey
Woodinville
Poulsbo
Edmonds
Aberdeen
Shoreline
DuPont
Monroe
Castle Rock
Edgewood

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle

Seattle (SEA)